/Engine/Source/Runtime/Engine/Classes/Engine/AssetManager.h
Gets list of allFAssetDatafor a primary asset type, returns true if any were found
virtual bool GetPrimaryAssetDataList ( [FPrimaryAssetType](API\Runtime\CoreUObject\UObject\FPrimaryAssetType) PrimaryAssetType, [TArray](API\Runtime\Core\Containers\TArray)< [FAssetData](API\Runtime\CoreUObject\AssetRegistry\FAssetData) > & AssetDataList ) const